NMR, STRUCTURE AND SPECTROSCOPIC INVESTIGATIONS ON A CESIUM-AMMONIUM CADMIUM TRICHLORIDE
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1 Research and Reviews in Materials Science and Chemistry Vol. 4, Issue 1, 2014, Pages ISSN Published Online on July 19, Jyoti Academic Press NMR, STRUCTURE AND SPECTROSCOPIC INVESTIGATIONS ON A CESIUM-AMMONIUM CADMIUM TRICHLORIDE A. BEN CHRIFA, A. BEN SALAH and M. LOUKIL Laboratoire des Sciences des Matériaux et d Environnement Faculte des Sciences de Sfax-3018 Tunisie m.loukil@yahoo.fr Abstract The structure of cesium-ammonium cadmium trichloride 0.99 ( NH4 ) Cd3, has been determined by X-ray single crystal analysis at room temperature. This material crystallizes in Ia-3 space group with Z = 8, and unit cell dimension a = ( 4) Å. Several cycles of least squares refinement reduced the disagreement R(F) factor for 342 reflections to a final value of and W R2 for The compound structure consists of ( or NH 4 ) ions and Cd 6 octahedra ensuring the stability of the structure by ionic and hydrogen bonding contacts N H. The NH 4 substitution gives more orientation disorder in the structure at room temperatures. IR and Raman spectroscopy studied at room temperature were performed to confirm results of the X-ray diffraction. Keywords and phrases: cadmium, structure, X-ray, NMR, IR. Communicated by Darina Simedru. Received March 4, 2014; Revised April 30, 2014
2 18 A. BEN CHRIFA et al. 1. Introduction Compounds based on cadmium have attracted much attention because of their applications in optics and acoustics. These materials are also of special interest because they undergo structural transitions [1-5]. Crystals of AB 3 family (A being alkali and B = Cd, Mn), undergo phase transitions to structures that are slightly distorted from ideal Perovskite-type structures [6, 7]. The phase transition temperatures and the structures of the AB 3 (A = and B = Cd, Mn) crystals are different from one another, but their phase transition mechanisms are distinguished as the quadruple and magnetic origin. The differences between the chemical properties of Cd and Mn are attributed to the nature of the phase transitions of these crystals. Therefore, the relaxation mechanisms of these different types of AB 3 crystals (quadruple and magnetic) are completely different NMR behaviour [7]. Mixed metal halides of the ABX 3 type [A = alkali metal, B = divalent 2 2 metal Pb, Cd, and X a halogen] belong to the Perovskite like structure, slightly distorted by cation displacements or by tilts of BX 6 -octahedra as compared with the ideal cubic structure. The nature of the distortions is connected with the instability of lattice with respect to one or several vibration modes [8]. In this paper, we report the structure of 0.99 ( NH4 ) Cd3 at room temperature in order to examine the effect of the cationic substitution on symmetry related to the ammonium dynamics.
3 NMR, STRUCTURE AND SPECTROSCOPIC Experimental 2.1. Synthesis 0.99 ( NH4 ) Cd3 was synthesized by dissolving a mixture of, NH4, and Cd 2 in hot water, the chemical reaction is H O ( x ) xnh Cd 2 ( NH ) Cd. Colourless thin rectangular parallelepiped crystals were grown after vapourizing in air for 18 days approximately X-ray structure determination The crystal structure of 0.99 ( NH4 ) Cd3 was studied using an APEX II diffractometer with graphite-crystal monochromatic MoK α radiation ( Å ). A total of 342 reflections were collected, among which only 114 reflections, namely those for which Fo > 4σ( Fo), were used to determine and refine the structure. Corrections were made for Lorentz polarization and absorption effects. Data collection procedure and structure refinement at room temperature, are given in Table 1.
4 20 A. BEN CHRIFA et al. Table 1. Crystal structure data and experimental conditions of structure determination for 0.99 ( NH4 ) Cd3 Summary of crystallographic data T = 296( 2) K Formula 0.99 ( NH4 ) Cd3 Formula weight Space group Ia-3 a ( Å) (4) Z 8 3 V( Å ) ρ calc 3 ( g cm ) µ ( mm ) 3 Crystal size ( mm ) Crystal shape (8) Parallelepipedic F(000) 1280 Data collection instrument Kappa-APEX II Radiation. graphite monochromator λ ( Å ) Kα Mo θ range for data collection ( ) Index ranges 10 h k Total reflections 342 Reflection with ( F > 4σ( F) ) 114 a R( F) (%) WR2 b (%) 0.05 R int -R σ a R = F. o FC F o b WR2 = 2 2 [ w( Fo FC )] 2 2 [ w( F )] o
5 NMR, STRUCTURE AND SPECTROSCOPIC 21 The cadmium atoms positions were determined by using a three dimensional Patterson synthesis. Chlorine, nitrogen, and cesium atoms were located by a three-dimensional Fourier function. The H atoms were located geometrically, and attributed isotropic thermal factors equal to those of the atoms on which they are linked. Structure solution and refinement were carried out by using (SHELX) programs [9, 10]. The non-hydrogen atoms were refined anisotropically. The atomic coordinates at room temperature are given in Table 2, the anisotropic displacement parameters in Table 3, the bond lengths and angles in Table 4. Table 2. Fractional atomic and equivalent thermal parameters Atoms x y z U eq Occupation Sites ¼ ¼ ¼ (3) 0.992(2) 8b N ¼ ¼ ¼ (3) 0.008(2) 8b H (5) (5) (5) (2) 16c H (2) 0.221(8) 0.246(10) (0) 48e Cd (3) 1 8a (2) 0 ¼ (3) 1 24d U eq = 1 3 i j Uij a i a j a i a j. 3 2 Table 3. Anisotropic displacement parameters ( in 10 Å ) Atoms U11 U22 U33 U23 U13 U (3) (3) (3) (2) (2) (2) N (3) (3) (3) (2) (2) (2) Cd 17(3) 17(3) 17(3) (1) (1) (1) (4) (4) 08(3) (7) 0 0
6 22 A. BEN CHRIFA et al. Table 4. Principal interatomic distances ( Å ) and bond angles ( ) ( NH4 ) Cd in i ii iii iv v vi vii viii ix x xi 3.691(2) (i) y 1/2. z. x 3.691(2) (ii) y. z 1/2. x 1/ (2) (iii) z. x. y 1/ (2) (iv) z 1/2. x /2. y 3.691(2) (v) x. y 1/2. z 3.697(2) (vi) y 1/2. z 1/2. x 3.697(2) (vii) y 1. z. x 1/ (2) (viii) z 1/2. x 1. y 1/ (2) (ix) z. x 1/2. y (2) (x) x 1/2. y 1/2. z 1/ (2) (xi) x 1/2. y 1. z H1 0.9(1) H2 0.9(1) xiv 2.612(1) (xiv) y. z 1/2. x 1/2 ii 2.612(1) (ii) y. z 1/2. x 1/2 C (1) xii 2.612(1) (xii) z 1/2. x 1/2. y iv xiii xiv xv xvi xvii xi 2.612(1) (iv) z 1/2. x /2. y 2.612(1) (xiii) x 1/2. y. z 1/ (2) (xiv) x. y 1/2. z 4.524(2) (xv) x 1. y. z 1/ (2) (xvi) z 1/2. x 1/2. y 1/ (2) (xvii) x 1/2. y 1/2. z 4.524(2) (xi) x 1/2. y 1. z Cd 2.612(2) xvi 3.697(2) (xvi) z 1/2. x 1/2. y 1/2
7 NMR, STRUCTURE AND SPECTROSCOPIC 23 Table 4. (continued) xvii i ii i iii ii iii i iv iv v i H1 ii H1 iv H1 v i H1 H2 iii iii H2 iv H2 vi H2 vii H2 ii viii xi ii xi x xi xiii viii ix x xi xi xiv xiv xii xii xiii 3.697(2) (xvii) x 1/2. y 1/2. z 180 (i) y 1/2. z. x 60 (ii) y. z 1/2. x 1/2 120 (iii) z. x. y 1/2 90 (iv) y 1/2. z 1/2. x (v) y 1/2. z. x 1/ (2) (vi) z 1/2. x 1. y 1/2 35.3(1) (vii) z. x 1/2. y (2) (viii) z 1/2. x 1/2. y 89.96(2) (ix) z 1/2. x 1/2. y ½ 51(5) (x) y. z 1/2.y 1/ (11) (xi) x. y 1/2. z 134(8) (xiv) x 1. y. z 1/2 102(8) (xii) x 1/2. y 1/2. z 78(8) (xiii) z 1/2. x 1/2. y 1/ (5) (5) 54.67(4) (4) (4) (4) (4) 90.07(4)
8 24 A. BEN CHRIFA et al Spectroscopic analysis The infrared absorption spectrum was carried out on a Perkin-Elmer 1750 spectrophotometer in the powdered sample dispersed in KBr cm range on a pellet on The Raman spectrum of polycrystalline samples sealed in glass tube was recorded on a Horiba Jobin yvon Raman spectrometer T64000 equipped with CCD detector. The spectrum was recorded in the region cm with a resolution of 2cm. 113 Cd MAS NMR spectra were measured on powdered crystals and glasses at 63, 637MHz with a Varian UNITY INOVA 400 MAS FT-NMR spectrometer. A single pulse sequence was used; for the crystals a pulse length of 2µ s, the accumulation of 5343 and a pulse delay of 3s. A cylindrical zirconia rotor in which a sample was put, was rotated at a speed of about 8000Hz. A 1M of Cd ( O 4 ) 2 aqueous solution was used as a standard.
9 NMR, STRUCTURE AND SPECTROSCOPIC Results and Discussion 3.1. Structure of 0.99( NH4 ) Cd3 description The crystal structure of 0.99 ( NH4 ) Cd3 is presented in Figure 1. Figure 1. Projection of the 0.99 ( NH4 ) Cd3 structure. At room temperature, 0.99 ( NH4 ) Cd3 single crystals have an cubic structure with eight molecules per unit cell, and belong to the Ia-3 space group. The lattice parameters is a = ( 4)Å at 293K. In this cubic phase, each Cd atom is surrounded by six atoms, which form a nearly regular octahedron. Cadmium atoms are located in the 8(a) sites ( 0, 0, 0) of the Ia-3 space group, surrounded by an octahedron chlorine atom in the 24(d) positions ( 0, 0, ¼ ). The or N atoms occupy also the 8(b) sites ( ¼, ¼, ¼). The or NH 4 tetrahedra, reside in between the octahedra with /N H... distances about 3.697(2) Å and /N angles varying from 60 to 180. The presence of NH 4 cations induces the coexistence of
10 26 A. BEN CHRIFA et al. H bonding contacts N H..., which providing a linkage between NH 4 cationic entities and [ Cd 6 ] 4 anionic complexes. Nitrogen or cesium atoms are nine fold coordinated by atom neighbors (Figure 3). The nitrogen N occupies the (8b) ( ¼, ¼, ¼) Wyckoff position. Therefore to determine the hydrogen positions, there are three probable cases: Four special positions (8b or 8a). Two special positions (16a). One position of multiplicity of 32, is impossible because there is no Wyckoff position with this multiplicity in the Ia-3 space group. We deduced that it is impossible to apply one of these cases, while taking into account a 0.9Å distance for the N H bond. For this reason, it was thought that in this structure the ammonium groups probably have an orientation disorder. Therefore, two hydrogen atoms were placed in both (48e) general and (16c) special positions selected from the three-dimensional Fourier function, leading to a two-fold disorder model of the ammonium groups Influence of ammonium-substituting on the Cd 3 structure To understand the NH 4 substituted effect on halogenocadmate, the structures of Cd3, 0.99 ( NH4 ) Cd3, and NH 4Cd3 materials are compared. Comparison with Cd 3 [11] compound, we can deduce that the title compound crystallizes in the same structure but with a relative increase of the maximal cation-chlorine distances and a decrease of the minimal cation-chlorine distances. This variation is accompanied by a relative contraction of Cd bonds. The Cd distance values in Cd 3 ( 2.64Å) [11] are relatively higher than those in 0.99 ( NH4 ) Cd3( 2, 612( 1) Å ) (Figure 2).
11 NMR, STRUCTURE AND SPECTROSCOPIC 27 Figure 2. Cadmium environment. Figure 3. NH 4 environment.
12 28 A. BEN CHRIFA et al. However, in the NH 4Cd3 material [12], these distances are slightly shorter than those observed in Cd 3 and 0.99 ( NH 4 ) Cd 3 : 2.513( 2) 2.660( 2) Å. This fact suggests that the Cd 6 octahedron adopts a rather geometry with shorter Cd distances in the pure ammonium compound. Details of lattice parameters and the cell volume of Cd 3, NH 4Cd 3 and 0.99 ( NH4 ) Cd3 materials are given in Table 5. The net behaviour is a decrease of the unit cell volume as well as the b and c parameters with partial substituting cesium by ammonium.
13 Table 5. Lattice parameters, unit cell volume, and interatomic distances for Cd 3, 0.99 ( NH4 ) Cd3, and NH 4Cd3 samples Compounds a ( Å) b ( Å) ( Å) c 3 V( Å ) Cd ( Å) /N ( Å) NH 4Cd 3 [11] 9.026(3) 3.994(1) (4) (2) 2.660(2) 3.278(6) 3.818(8) 0.99 ( NH4 ) Cd (4) (4) (4) (1) 3.691(2) 3.697(2) Cd 3 [12] (1) 3.84(3)
14 30 A. BEN CHRIFA et al Vibrational studies To have more information on the crystal structure, we have undertaken a vibrational study by using infrared spectroscopy and Raman scattering. The tentative assignments of the vibrations are based on a comparison of the infrared and Raman spectra of 0.99( NH4 ) Cd3 with other compounds based on cadmium [13]. The Raman and infrared peaks frequencies are quoted in Table 6. 1 Table 6. Wavenumbers ( cm ) of the bands observed in the IR and Raman spectra at 298K of 0.99 ( NH4 ) Cd3 and their tentative assignments ( ν : stretching; δ : deformation) Raman IR Wavenumbers ( cm ) 500 δ ( H 2 O) δ 4 s( NH ) δ 4 s( NH ) δas NH 4 ( ) 50 Lattice mode translation 76 translation 95 translation 110 Cd 2 libration 147 NH 4 translation 208 NH 4 libration 232 ν ( Cd ) The IR spectra of 0.99 ( NH4 ) Cd3 (Figure 4) were recorded for the wave number region between 4000 and 400cm. The IR spectra show, at high wave numbers, a band at 3500cm deformation H 2 O vibration, and a band observed at may be assigned to the 2934cm relative
15 δ 4 NMR, STRUCTURE AND SPECTROSCOPIC 31 to the ( NH ) stretching modes. The symmetric and asymmetric bending 4 vibration of ( NH ) appears in two bands at 1640 and 1374cm. Figure 4. Infrared absorption spectrum of 0.99 ( NH4 ) Cd3. The Raman spectrum of 0.99 ( NH4 ) Cd3 was recorded in the external region of the sub-lattice vibrations, cm (Figure 5). Compared with mercury compounds [13], the observed Raman lines at 50cm is associated to the lattice mode translation. The bands at 147 and 208cm correspond to the NH 4 libration. The band at 110cm corresponds to the Cd 2 libration of the layers and the chains. We have assigned the band at translation mode of respectively. 95cm and the shoulder at 76cm anion and to the translation mode of to the cation,
16 32 A. BEN CHRIFA et al. From these vibrational studies, we can confirm the presence of the ammonium groups in the structure. Figure 5. Low-frequency Raman spectra of 0.99 ( NH4 ) Cd NMR spectroscopy 0.99( NH4 ) Cd3 with a cubic structure is expected to have a seven-line NMR spectrum due to the quadruple interactions of Cd( I = 7 2). Instead of seven resonance lines, the Cd nuclei in 0.99 ( NH4 ) Cd3 produce only one resonance line in the temperature range K, as shown in Figure 6. This result indicates that we have only one local structure around the Cd atoms. The same behaviour was detected in cadmium thiocyanate compounds [14]. According to this result provided by the NMR measurements at room temperature, we can confirm the octahedral coordination for cadmium atoms, which confirms the results of the single crystal measurements.
17 NMR, STRUCTURE AND SPECTROSCOPIC 33 Figure 6. NMR spectrum for temperature. 113 Cd in 0.99 ( NH4 ) Cd3 at room 4. Conclusion In conclusion, we have successfully prepared a novel substituted halogenocadmate 0.99( NH4 ) Cd3 via slow evaporation method. The crystal structure of the title compound is characterized by Cd 6 octahedra. The cesium or ammonium cations are inserted between these octahedra ensuring the stability of the structure by ionic and hydrogen bonding contacts N H... The ammonium substitution in Cd 3 material gives more disorder of the ammonium groups in the structure and leads to a decrease of the unit cell volume as well as the b and c parameters. However, we noted an increase of the a parameter. This finding appears to reflect the difference of between the ionic radii of and NH 4 cations. In addition, analysis by IR spectroscopy and Raman scattering confirms the presence of ammonium group and Cd 6 octahedra in our compound. MAS-NMR spectrum of of cadmium in the structure. 113 Cd confirms the octahedral coordination
18 34 A. BEN CHRIFA et al. References [1] M. Mohammadi and D. Fray, Acta Mater. 57 (2009), [2] W. Ch. Zheng and S. Y. Wu, Physica B 301 (2001), 186. [3] J. Dhahri, A. Dhahri, M. Oumezzine, E. Dhahri, M. Said and H. Vincent, J. Alloys Compd. 467 (2009), 44. [4] M. B. Bellakki and V. Manivannan, J. Mater. Sci. 45 (2010), [5] M. Yang, Z. Wen-Chen and H. Lv, Spectrochim. Acta A 72 (2009), 515. [6] S. Sakida and Y. Kawamoto, J. Phys. Chem. Solids 63 (2002), 151. [7] A. R. Lim and S. Y. Jeong, J. Solid State Chem. 178 (2005), [8] F. Hamzaoui, I. Noiret, G. Odou, F. Danede and F. Baert, J. Solid State Chem. 124 (1996), 39. [9] G. M. Sheldrick, SHELXS97, Program for the Refinement of Crystal Structures, University of Gottingen, Germany, [10] G. M. Sheldrick, SHELXL97, Program for the Refinement of Crystal Structures, University of Gottingen, Germany, [11] M. M. Rolies and C. J. De Ranter, Acta Cryst. B 34 (1978), [12] W. A. Hart, O. F. Beumel and T. P. Whaley, Pergamon Texts in Inorg. Chem. 13 (1973), 14. [13] M. Loukil, A. Kabadou, Ph. Salles and A. Ben Salah, Chem. Phy. 300 (2004), 247. [14] K. Eichele and R. E. Wasylishen, Inorg. Chem. 33(13) (1994), g
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